[Bldg-sim] Transformers in Energy Model

[Sami, Vikram]

I should have mentioned I was referring to eQUEST...

Vikram Sami, LEED AP
Sustainable Design Analyst
1382 Peachtree St. NE, Atlanta, GA 30309
t: 404-443-7462    f: 404.892.5823       e: vikram.sami at perkinswill.com   www.perkinswill.com<http://www.perkinswill.com/>
Perkins+Will.  Ideas + buildings that honor the broader goals of society


From: bldg-sim-bounces at lists.onebuilding.org [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Sami, Vikram
Sent: Wednesday, August 11, 2010 4:31 PM
To: Jason Boehning; bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] Transformers in Energy Model

You can model transformer sizes and losses in the detailed edit mode when you open up you electric meter.

I have to confess I have not modeled a transformer in a model yet (the default is not to model a transformer and the loss associated). You can specify a loss part load curve too:

TRANS-LOSS-FPLR
Takes the U-name of a curve that gives the multiplier on TRANSFORMER-LOSS as a function of the part load ratio (current hour load on the meter divided by TRANSFORMER-SIZE). The transformer loss is calculated hourly as
          (TRANSFORMER-SIZE) x (TRANSFORMER-LOSS) x (TRANS-LOSS-FPLR value)
The load is the sum of that due to all directly connected equipment and, for TYPE = UTILITY and BUILDING, other ELEC-METERs. The default curve is linear from 0.1 at zero load to 1.0 at full load.

Like I said I haven't done it yet - good luck. Let me know how it turns out

Vikram Sami, LEED AP
Sustainable Design Analyst
1382 Peachtree St. NE, Atlanta, GA 30309
t: 404-443-7462    f: 404.892.5823       e: vikram.sami at perkinswill.com   www.perkinswill.com<http://www.perkinswill.com/>
Perkins+Will.  Ideas + buildings that honor the broader goals of society


From: bldg-sim-bounces at lists.onebuilding.org [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Jason Boehning
Sent: Wednesday, August 11, 2010 4:14 PM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] Transformers in Energy Model

I am new to energy modeling and I am curious if there is a way to take credit for more efficient transformers in an energy model. Some of our transformer reps have said that there is not a LEED credit for more efficient transformers, but you have to gain the credit through the energy model. Would it just be through more heat in a space? I appreciate any information I can get in this matter.

Best Regards,


Jason Boehning, EIT

Mechanical Engineer

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6161 Savoy, Suite 1212
Houston, Texas  77036

 v.  713.482.2322
 f.   713.482.2314
 e. Jason.Boehning at ricegardner.com<mailto:Jason.Boehning at ricegardner.com>


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